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Permanent mtu adjustment
Authored by: institute3 on Jun 26, '02 04:59:47PM

Posted by Institute3 (Bob Hager)
Is the procedure that you outlined also applicable to an ethernet
link? I have my powermac G4 933 networked with my PC running XP using
ICS. Connection is via a linksys card in the PC and a crossover RJ45
cable..

My broadband connection to the internet is via DirecPC (one way). Not able
to get DSL or cable where I live.

Recently upgraded to version 10.1.5 on the MAC..

Tried to modify the MTU via the terminal app but Darwin would not let me do the
update... permission denied.. and I logged in as system administrator..

This is the procedure that I used:

MTU
1) Start Terminal.app
2) sudo (login as rootuser)
3) type "ifconfig en0 mtu 1460" for your hardwired ethernet port and type "ifconfig en1 mtu 1460" for your airport connection if utilizing this one
4) now its time for the kernel extensions...

Kernel Extensions
1) Start Terminal.app (if you closed it between steps"
2) sudo (login as rootuser if you closed the above session)
3) type the following
sysctl -w net.inet.tcp.rcvspace=224360
sysctl -w net.inet.tcp.delayed_ack=1
4) that's it quit the terminal.app and enjoy faster downloads.

Downside to this is, you have to type this each time you reboot the machine.

I suspect that I was doing something wrong when logging in as the root user. Must say that is am a babe in the woods when it comes to UNIX.

Thanks much for any assistance that you can provide...



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